We provide several pages with free downloads:
Applied Environmental Statistics course textbook
Software for handling nondetect data (Minitab, SAS, and standalone programs)
NADA for R. Software for the R statistical system for handling nondetect data
Trend analysis software
Much more is available when you take any of our courses, including software for partial plots, the quantile test, trend analysis (made easy), additional software for Kaplan-Meier and other methods for nondetects, and enhanced biplots. Look for one of our upcoming classes.